作者:Frieder W. Lichtenthaler、Bernd Köhler
DOI:10.1016/0008-6215(94)84076-8
日期:1994.5
carbonyl group of 3,4,6-tri-O-benzoyl-α- d -arabino-hexosyl-2-ulose bromide (8), readily accessible from the hydroxyglycal ester, can be reduced by cyanoborohydride without affecting the anomeric bromine; exclusive axial attack of the hydride affords the benzoylated glucosyl bromide 6 with a free 2-OH group (72%). This amounts to a five-step synthesis from d -glucose, free from chromatography, in 55% overall
摘要氰基硼氢化物可还原3,4,6-三-O-苯甲酰基-α-d-阿拉伯糖基己糖基-2-ulose溴化物(8)的羰基,而不会影响端粒溴; 氢化物的唯一轴向侵蚀得到带有游离2-OH基团(72%)的苯甲酰化葡糖基溴化物6。这相当于由d-葡萄糖进行的五步合成,无色谱,总产率为55%。溴化物6,或更具反应性的α-碘化物7,是通过卤素交换从6平稳生成的,容易发生α-或β-选择性糖苷化,强调了它们作为糖基供体的潜力,可用于生成(1→2)连接的寡糖。